US PRESIDENT Barack Obama personally dealt with a health scare while defending ObamaCare during a press conference at The White House - as a pregnant woman who stood directly behind him nearly fainted.

Mr Obama, nearing the end of his Rose Garden speech, turned around and put his arm around the woman to steady her.

Before the incident, Mr Obama said there was "no excuse" for the cascade of computer problems that have marred the roll out of key elements in his health care law, but declared he was confident the administration would be able to fix the issues.

"There’s no sugarcoating it," Mr Obama said. "Nobody is more frustrated than I am."

The president said his administration was doing "everything we can possibly do" to get the federally run websites up and running. And he guaranteed that everyone who wants to get insurance through the new health care exchanges will be able to.